Carbureter.



3. M. EVANS.

CARBURETER.

APPLICATION FILED DEC-31. 19x5.

1,232,260 Patented July 3, 1917.

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5] mum Wow Jam PSM-EUQRS J. M. EVANS.

CARBURETER. APPLICATION FILED DEC-3h 1915. v 1,232,260. Patented July 3,19%

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STATES PATENT OFFICE. JAMES m. EVANS, onwns'rron'r, connnc'ricu'r, ASSIGNOR ronvmvs ENGINE com- PANY, mconrom'mnn CORPORATION on NEW YORK.

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To all whom it may concern:

Be it known that 1, JAMES M. EVANS, a citizen of the United States, and a resident of- Westport, county of Fairficld, State of Connecticut, have invented certain new and useful Improvements in Carbureters, of which the following is a description, My invention relates to a carbureter of a type wherein measured charges ofhydrocarbon or any suitable liquid fuel are conveyed from. a reservoir of the liquid to a mixing chamber and subjected to impacts or blows sufiicient to vaporize them and to cause the resulting vapor to thoroughly mix with the air which passes through the mixing chamber on its way to the engine, and is an improvement on the carbureters of this same type, described in my pending application, Serial No. 866,276, filed October 12, 1914.

Inthe drawing accompanying and forming a part of this specification, I have illustrated the preferred embodiment of my invention, which will be readily understood from a description of this preferred embodiment.

Referring to the drawing, 7 Figure 1 is a side elevation view of the assembled carbureter, a portion of the mechanism being shown in section;

Fig. 2 is a section view taken on the line 2 of Fig. 1;

Fig. 3 is a section view on line 3 of Fig. 1;

Fig. ,4 is a detailed view showing the construction of the cam member for operating the plungers;

Fig. 5 is another detailed view showing 7 further details of the mechanism employed for operating the plungers;

Fig. 6 is a detailed view showing, in sec tion, the rotatable carrier adapted to convey liquid from the reservoir chamber to the mixing-chamber, the plungers being removed; I

Fig. 7 is an end view of the structure shown in Fig.6;

Figs. 8, 9 and 10 are detailed views showing the construction of the member carrying the cam groove for operating the pluners. b Fig. 11 is a detail view showing the bridge member carrying that portion of the cam groove employed to drive'the plungers in for the purpose of vaporizing the fuel.

Referring in detail to these drawings, the numeral 1 designates a float chamber of Specification 61 Letters Patent.

Patented July 3, 1917.

App licatio n filed December 31, 1915. Serial No. 69,691.

any approved type, for maintaining the liquid fuel under a slight head or pressure 1n,

the fuel reservoir 2. 3 designates a rotatable carrier mounted on a shaft 4 and adapted to be driven byv the engine through gear 5. The carrier 3 is provided with two oppositely disposed recesses 6, (see Fig. 6) in which the plungers 7 are mounted and adapted to reciprocate The outer ends of these plungers are provided with projecting rollers 8, which rest in the cam groove 9. The normal shape of this. cam groove 9, which is adjustable, is such that as the car'- In order that the volume of the individual 4 oil charges may be adjusted by the operato'r to suit various operating conditions, the cam groove9 is made adjustable in the following manner :It is formed on the outer face of a circular member 11, and this member is formed oftwomain parts 12 and 13. The part 12 is held in fixed relation to the frame of the carbureter, as by a screw 14, while the part 13 is mounted on the shaft 16 and is adapted to be moved endwise by the threads 15 when the shaft is rotated. The rotation of the shaft is eifected by the gear sector 16 which meshes with gear sectory16 on the shaft 17. The latter carries the lever 18 which is arranged to be moved by'the operator. The bridge members 19 and 19 each carry a short section of the cam groove, and they have projecting lugs l9 at their end, which engage recesses 19 in "rier 3 rotates, the plungers are brought opthe members 12 and 13. By shifting the section 13, therefore, the portions of the cam groove in the members 19 and 19 may be altered so as to give the pistons the desired throw. 20 designates a'throttle for the mix ture, and this is mounted on theshaft 17, so that when the lever- 18 is operated to change the throw of theplungers 7, it also operates the throttle to correspondingly reduce the charge entering the engine, there- 'bymaintaining the right mixture under all conditions of operation. The pin 16 on the shaft 16 moves in a slot 16 and governs the maximum adjustment o f the lever 18 in both directions.

It will be noted that the section of the cam groove carried by the bridge member 19 (see Fig. '11) employed to force the plungers in, is so shaped that the plungers will be closed suddenly. The shape of this 'cylinder-two-cycle engine.

particular section of the groove will vary somewhat, depending, among other things, on the speed at'which the device is driven, but in all cases the plungers should be driven in with suflicient speed and force to vaporize the small individual charges ,of fuel. It will also be noted that the section of the groove carried by bridge 19 (see Figs. 4 and 5) for withdrawing the plungers isv so shaped that the plungers will be withdrawn gradually.

The particular embodiment of my carbureter shown in the drawing is best adapted, if running at.engine,speed, to operate a four-cylinder-four-cycle engine, or a two- It is obvious,

' however, that if run at a different speed, or

0r four-cycle type.

if' provided with more or less plungers, it can be'adapted to, operate an engine of any number of cylinders of either .the two-cycle In this connection, I should explain that I prefer .to so arrange the device that an individual charge of fuel is delivered and vaporized for each explosive stroke of the engine. It may be used,

however, running out of synchronism with the engine, but not to such good advantage.

I will now describe the operation of the device as shown and as used with a fourcylinder-four-cycle engine. When so used, the gear 5 ,is driven at engine speed and turns the shaft 4 and disk or carrier 3 at the charges, which mix with the air passing through the chamber and are drawn into the engine. If it is deslred to slow the engine down, the lever 18 is moved so as to partially close the throttle and so. as to bring the portion of the cam grooves in the bridges 19 and 19 more nearly in line withthe body of the cam groove; in other words, so as to give the plungers 7 a shorter throw. This causes a reduced amount of mixture to be drawn into the cylinders. When it is desired to increase the speed and power of the engine, the lever 18 is moved in the opposite direction and the bridges 19 and '19 are shifted .so as to give the plunstrength. If the throttle is entirely' closed,

It will be notedv the cam groove is altered so that the plunr gers do not reciprocate.

It should further be noted that under. all conditions of adjustment, the plungers 7 completely close the recess in which they slide on their impact or vaporization stroke; also that the cam groove inthe'bridge 19 which operates to close the plungers 7, is made particularly steep so that this closing will take place with great rapidity and with suflicient speed to vaporize the fuel, instead of merely ejecting it as a liquid. In prac tice, this closing may be effected in about one-thirtieth of the time required for a complete revolution. As the device is running at engine speed, and as this may be as high as three thousand revolutions per minute, this means that the plunger is closed in about one fifteen hundredths of a second.

Having now described my invention, what I claim is: I

1. In a device of the kind described, a liquid fuel chamber, a mixing chamber, a rotatable member disposed between the said chambers and having a recess arranged to move from the fuel chamber to the mixing chamber, and to convey a charge of liquid fuel from the one to the other, a cam member bearing a cam surface disposed adjacent said rotatable member, and a plunger having its body disposed in said recess and having a projecting end in engagement with said cam surface, whereby the plunger is withdrawn to open the recess when incom munication with the fuelchamber, so that it will receive a charge of liquid fuel, and is advanced rapidly and forcibly against the end of the recess when the latter is in communication with the mixing chamber, to

subject the charge of liquid fuel to impact and expel it into the mixing chamber.

2. In a device of the kind described, a liquid fuel chamber, a mixing chamber, a rotatable member disposed between the said chambers and having a recess adapted to open in the reservoir chamber and to close in the mixing chamber, a member fixed against rotation bearing a cam surface disposed adjacent said rotatable member, a plunger having its body disposed in said recess and its projecting end in enga ement with said cam surface, and means for adjusting the shape of said cam groove, all for' the purpose described.

3. In a device of the kind described, a liquid fuel chamber, a mixing chamber, a rotatable member disposed between said chambers and having a plurality of recesses adapted to be open in the fuel chamber and closed in the mixing chamber, a member bearing a cam surface and disposed adjacent the first member, a plurality of plungers having their body portions disposed in said recesses and having their projecting ends in engagement with said cam surface, and

means for adjusting the shape of said cam surface, all for the purpose and substantially as described.

4. In a device of the kind described, a liquid fuel chamber, a mixing chambelga r01 tatable disk disposed between the-two, a plurality of recesses in said disk adapted to move from the fuel chamber to the mixing chamber, plungers in said recesses, a cam surface adapted to engage the projecting ends of saidfplungers, and so shaped as to vwithdraw the plungers and open the re' cesses in the reservoir, thereby filling the same with liquid, and to force the plungers into the recesses when the recesses are brought into communication with the mixing chamber, with sufiicient force and speed as to vaporize by impact the liquid fuelin the recess, substantially as described.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses. j I

a j 7 JAMES M. EVANS. Witnesses:

7 Enw. V. Comm HENRY M. WARD. 

